Tyre comprising a layer of circumferential reinforcing elements
A technology of reinforcing elements and reinforcing parts, which is applied to the reinforcement layers of pneumatic tires, special tires, tire parts and other directions, can solve the problems of adverse effects on the durability of tire crown reinforcements, increased driving distance, etc.
Active Publication Date: 2017-03-01
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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Problems solved by technology
The combination of conditions in which the tires are driven undoubtedly results in increased distances traveled and reduced wear on the tires; but on the other hand, the durability of the tires and especially the crown reinforcement is adversely affected
Method used
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Embodiment Construction
[0138] exist figure 1 In , a tire 1 of size 315 / 70R 22.5 has an aspect ratio H / S equal to 0.70, where H is the height of the tire 1 on its mounted rim and S is its maximum axial width. Said tire 1 comprises radial carcass reinforcement 2 fixed in two beads (not shown in the figures). The carcass reinforcement is formed from a single layer of metal cords. Said carcass reinforcement 2 is hooped by a crown reinforcement 4 formed radially from the inside to the outside by:
[0139]- a first working layer 41 formed of unencapsulated non-extensible 9.28 metal cords continuous over the entire width of the ply and oriented at an angle of 24°,
[0140] - a layer 42 of circumferential reinforcing elements formed of 21x23 steel metal cords of the "dual modulus" type,
[0141] - A second working layer 43 formed of unencapsulated non-extensible 9.28 metal cords continuous over the entire width of the ply and oriented at an angle of 24° and aligned with the metal cords of layer 41 cross...
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Abstract
The invention relates to a tyre comprising a crown reinforcement formed of at least two working crown layers formed of reinforcing elements inserted between two liner layers of rubber compound, a first layer S of polymer compound being in contact with at least one working layer and in contact with the carcass reinforcement and the crown reinforcement comprising at least one layer of circumferential reinforcing elements. The modulus of elasticity under tension at 10% elongation of a liner layer of a working crown layer is less than 8.5 MPa, the maximum value of tan (Delta), denoted tan (Delta)max, of said at least one skim of at least one working crown layer is less than 0.100 and the complex dynamic shear modulus G*, measured at 10% and 60 DEG C on the return cycle, of said first layer S of polymer compound is greater than 1.35 MPa.
Description
technical field [0001] The present invention relates to tires with radial carcass reinforcement, and more particularly to tires intended to be fitted on vehicles carrying heavy loads and traveling at sustained speeds, such as trucks, tractors, trailers, or coaches. Background technique [0002] In tires of the heavy-duty type, the carcass reinforcement is generally anchored on either side in the bead area and is radially covered by a crown reinforcement consisting of at least two layers overlapping and Formed by threads or cords parallel in each layer and crossing from one layer to the next forming an angle with the circumferential direction of between 10° and 45°. Said working layer forming the working reinforcement may further be covered by at least one layer, called protective layer, formed by reinforcing elements, advantageously metallic and stretchable, and called elastic reinforcing elements . The tire may also comprise a layer of low-stretch metal threads or cords f...
Claims
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IPC IPC(8): B60C1/00B60C9/18
CPCB60C9/1835B60C9/2006B60C2009/2064B60C2009/1878B60C2001/0075B60C2001/0066B60C9/185C08K3/04C08K3/22C08K3/36C08K2003/2227
Inventor H·雷哈布J-F·帕尔曼蒂尔
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN